Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W28/00—Network traffic management; Network resource management
  • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
  • H04W28/18—Negotiating wireless communication parameters

Definitions

• the present invention relates to a telecommunications system and method for early transmission of data in a telecommunications system, and more particularly, but not exclusively, to a telecommunications system and method implemented in accordance with the evolved Universal Terrestrial Radio Access Network
• E-UTRAN evolved Universal Terrestrial Radio Access
• E-UTRA evolved Universal Terrestrial Radio Access
• UMTS Universal Terrestrial Radio Access Network
• This limitation of UMTS has been the cause of poorer performance for applications like Push to Talk over Cellular (PoC) compared to General Packet Radio Service (GPRS).
• PoC Push to Talk over Cellular
• GPRS General Packet Radio Service
• RRC Radio Resource Control
• NAS Non-Access Stratum
• RAB Radio Access Bearer
• SIP Session Initiation Protocol
• FIG. 1 schematically illustrates the E- UTRAN architecture.
• User Equipment (UE) 1 communicates with an E-UTRAN NodeB (eNB) 2, with data being sent on radio bearers (RBs) over a radio link 3 between them.
• eNB E-UTRAN NodeB
• RBs radio bearers
• aGW Access Gateway
• the functions hosted by the eNB are: selection of aGW at attachment; routing towards aGW at RRC activation; scheduling and transmission of paging messages; scheduling and transmission of Broadcast Control Channel (BCCH) information; dynamic allocation of resources to UEs in both uplink and downlink; the configuration and provision of eNB measurements; radio bearer control; radio admission control; and Connection Mobility Control in the LTE_ACTIVE state.
• BCCH Broadcast Control Channel
• aGW paging origination
• LTE E LE state management
• PDCP Packet Data Convergence Protocol
• SAE System Architecture Evolution
• NAS Non-Access Stratum
• FIG 2 illustrates the messaging required for transmission of data between the UE 1 and the aGW 4.
• the messaging is used in establishing an RB between the UE 1 and the eNB 2, and an access bearer between the eNB 2 and the aGW 4, the latter including a Mobile Management Entity (MME) 5.
• MME Mobile Management Entity
• the delays and messaging involved during the establishment of a data communication path are denoted in Figure 2 by numbered steps from Step 1: "Delay for RACH scheduling period" to Step 16: "H-ARQ Retransmission”, and the steps sequentially occur in the order shown.
• Step 1 Delay for RACH scheduling period
• Step 16 “H-ARQ Retransmission
• TA Tracking Area
• H-ARQ Hybrid Automatic Repeat Request
• RNC radio network controller
• the savings from Early RB establishment can be estimated to be 29 ms, compared with a total delay estimate of 49 ms (for the same 5 ms Sl delay), leading to a saving of about 60%.
• One way to achieve early RB establishment could be by using a "default" RB which is assumed to be established at the time of the attach, but any proposal must not introduce excessive complexity or security issues and does not provide the same flexibility in terms on which RB the UE can send data on.
• the UE may have multiple RBs and it must be possible to identify which RB the data belongs to.
• a Tunnel Endpoint Identifier (TEID) field is included in the data packets sent over the Sl interface to identify the RB.
• the TEID for each RB is negotiated by signalling between the eNB and aGW. With Early RB establishment, this signalling will not completed at the time the uplink packet arrives in the eNB to be sent to the aGW. The Early radio bearer establishment procedure must also provide a means to identify the RB that the packet belongs to at the aGW.
• a method of transmission of data in a telecommunications system includes the steps of: providing pre-set values, associated with an early radio bearer, at a user equipment and at a base station; and the user equipment and the base station each autonomously configuring an early radio bearer between them using the pre-set values, such that data can be transmitted between the user equipment to the base station using the early radio bearer.
• the configuration by the user equipment and base station may be carried out immediately following an initial signaling exchange for the RRC connection establishment.
• the base station is an eNB.
• the invention enables a default RB to be set up to permit early transmission of data, without excessive additional complexity.
• the method may include downloading user equipment context from a core network and then re-configuring the established early radio bearer using the values received in the user equipment context.
• the core network may be represented by an aGW in an E-UTRAN system, for example.
• transport parameters for transmission of data over the Sl interface are also required to be available at the eNB to transport data to the aGW.
• the parameters involved are the User Plane Entity (UPE) IP address, UDP port number and Tunnel Endpoint Identifier (TEK)).
• the UPE address may be provided by the UE.
• a temporary UE id may be mapped on to a UPE address as is done for the control plane in Iu-flex systems.
• a UDP port at the eNB is preconfigured to act as an early radio bearer UDP port.
• a data packet transmitted over the early radio bearer is buffered at the eNB until the TEID is supplied from the aGW.
• Another method uses a default TEID with an additional logical channel ID field in the header.
• Yet another method includes logical flow information in the PDCP header for those instances were the packet is sent before the radio bearer is established.
• One such method may be provided, or a combination of them may be used.
• a telecommunications system comprises at least one base station and user equipment, the base station including a store for storing preset values, associated with an early radio bearer, the user equipment including a store for storing preset values, associated with an early radio bearer, and means for each of the user equipment and the base station to autonomously configure an early radio bearer between them using the stored pre-set values.
• the system may be one that is in accordance with the E-UTRAN standard, the base station being an eNB.
• a user equipment comprises a store for storing preset values associated with establishing an early radio bearer in a telecommunication system.
• Figure 1 schematically illustrates E-UTRAN architecture
• Figure 2 schematically illustrates messaging associated with an E-UTRAN system
• Figures 3 and 4 schematically illustrate a method and E-UTRAN system in accordance with the invention
• FIG. 5 schematically illustrates messaging associated with an E-UTRAN system in accordance with the invention.
• a UE 6 includes a store 9 in which are stored preset values relating to the Quality of Service, Medium Access Control, (MAC), and Radio Link Control (RLC).
• an eNB 8 has a store 9 that stores preset values for the same parameters.
• the aGW stores the security context.
• the Sl transport bearer between the eNB 8 and the aGW 10 is configured.
• the required data is already stored at the aGW 10, as stored preset values.
• the data stored in the eNB does not include user specific information like the TEED to be used for each RB.
• User data is transmitted between the UE 6 and eNB 8, and between the eNB 8 and the aGW 10, as shown at 14.
• FIG 5 illustrates the messaging associated with the arrangement illustrated in Figure 4, with Steps being given the same numbering as that shown in Figure 2. It can be seen from this that the order of the steps is now different, for example Step 10 occurs after Steps 15 and 16. By deferring some of the steps relative to others, overall delays in the system may be reduced compared to the Figure 2 message flow.
• Data packets sent on the early radio bearer are encrypted with encryption including a sequence number associated with a data packet.
• the sequence number is also used to discard duplicated packets.
• Figures 6 to 9 An alternative to the Early establishment of the Sl interface is shown in Figure 6. In this case, packets are buffered in the eNB until the UE context response from the aGW 10 is received.
• Figure 7 illustrates another approach to identify the RB that the packet belong to, in which an additional header element is used to identify the logical channel in addition to the Tunnel Endpoint Identifier (TEID) over the eNB to aGW Sl interface.
• TEID Tunnel Endpoint Identifier
• Figure 8 shows another method, in which special values of TEID are preconfigured to identify the logical channel exclusively for the Early data bearer. This is a temporary assignment and released as soon as the proper bearer is established. Thus, only a small number of preconfigured values are required. The TEED is subsequently reconfigured to the correct one to identity the logical channel of the real bear established subsequently.

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• Engineering & Computer Science (AREA)
• Quality & Reliability (AREA)
• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Mobile Radio Communication Systems (AREA)

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• 2006
  • 2006-08-23 US US11/508,352 patent/US20080051084A1/en not_active Abandoned
• 2007
  • 2007-08-09 KR KR1020097005709A patent/KR20090045358A/ko not_active Ceased
  • 2007-08-09 EP EP07866158A patent/EP2055058A2/de not_active Withdrawn
  • 2007-08-09 WO PCT/US2007/017733 patent/WO2008024215A2/en not_active Ceased
  • 2007-08-09 CN CNA2007800314079A patent/CN101507325A/zh active Pending
  • 2007-08-17 TW TW096130426A patent/TW200826697A/zh unknown

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